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Preparation method of composite material containing multi-walled carbon nanotubes and tin-cobalt alloy nanoparticles

A technology of multi-walled carbon nanotubes and nanoparticles, applied in the field of material science, to reduce agglomeration, the method is simple and easy, and the effect of reducing cycle stability

Inactive Publication Date: 2011-05-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, how to uniformly attach tin-cobalt alloy nanoparticles to the surface of multi-walled carbon nanotubes and synthesize such composite materials has not yet been solved.

Method used

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  • Preparation method of composite material containing multi-walled carbon nanotubes and tin-cobalt alloy nanoparticles
  • Preparation method of composite material containing multi-walled carbon nanotubes and tin-cobalt alloy nanoparticles
  • Preparation method of composite material containing multi-walled carbon nanotubes and tin-cobalt alloy nanoparticles

Examples

Experimental program
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Effect test

Embodiment 1

[0025] (1) 60 milligrams of multi-walled carbon nanotubes are added to 50 milliliters of 0.5 mol / liter sodium chloride aqueous solution, and ultrasonic 1 hour, adding 20 grams of mass percent concentration is 2% polyallylamine hydrochloride aqueous solution (containing poly About 0.4 grams of allylamine hydrochloride, the number-average molecular weight of polyallylamine hydrochloride is 100000~200000), and stirred for 0.5 hour, then centrifuged with deionized water and then centrifuged to obtain modified multi-walled carbon nanotubes ;

[0026] (2) 10 millimoles of sodium borohydride are dissolved in 20 milliliters of diethylene glycol;

[0027] (3) 3 mmoles of tin chloride and 1 mmoles of cobalt chloride are dissolved in 10 milliliters of diethylene glycol;

[0028] (4) Add 60 mg of the modified multi-walled carbon nanotubes obtained in step (1) to the solution prepared in step (2), disperse them by ultrasonication for 10 minutes to obtain a mixed solution, and heat up unde...

Embodiment 2

[0034] (1) 60 milligrams of multi-walled carbon nanotubes are added to 50 milliliters of 0.5 mol / liter sodium chloride aqueous solution, and ultrasonic 1 hour, adding 20 grams of mass percent concentration is 2% polyallylamine hydrochloride aqueous solution (containing poly About 0.4 grams of allylamine hydrochloride, the number-average molecular weight of polyallylamine hydrochloride is 100000~200000), and stirred for 0.5 hour, then centrifuged with deionized water and then centrifuged to obtain modified multi-walled carbon nanotubes ;

[0035] (2) 10 millimoles of sodium borohydride are dissolved in 20 milliliters of diethylene glycol;

[0036] (3) 1.5 mmol tin chloride and 0.5 mmol cobalt chloride are dissolved in 10 milliliters of diethylene glycol;

[0037](4) Add 60 mg of the modified multi-walled carbon nanotubes obtained in step (1) to the solution prepared in step (2), disperse them by ultrasonication for 10 minutes to obtain a mixed solution, and heat up under the p...

Embodiment 3

[0041] (1) 60 milligrams of multi-walled carbon nanotubes are added to 50 milliliters of 0.5 mol / liter sodium chloride aqueous solution, and ultrasonic 1 hour, adding 20 grams of mass percent concentration is 2% polyallylamine hydrochloride aqueous solution (containing poly About 0.4 grams of allylamine hydrochloride, the number-average molecular weight of polyallylamine hydrochloride is 100000~200000), and stirred for 0.5 hour, then centrifuged with deionized water and then centrifuged to obtain modified multi-walled carbon nanotubes ;

[0042] (2) 5 millimoles of sodium borohydride are dissolved in 10 milliliters of diethylene glycol;

[0043] (3) 0.6 mmol tin chloride and 0.2 mmol cobalt chloride are dissolved in 5 milliliters of diethylene glycol;

[0044] (4) Add 60 mg of the modified multi-walled carbon nanotubes obtained in step (1) to the solution prepared in step (2), disperse them by ultrasonication for 10 minutes to obtain a mixed solution, and heat up under the pr...

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Abstract

The invention discloses a preparation method a composite material containing multi-walled carbon nanotubes and tin-cobalt alloy nanoparticles. The preparation method comprises modifying the multi-walled carbon nanotubes with polyelectrolytes; preparing diethylene glycol solution containing sodium borohydride; preparing diethylene glycol solution containing stannic chloride and cobalt chloride; dispersing the modified multi-walled carbon nanotubes in the diethylene glycol solution containing sodium borohydride, and heating to a certain temperature under the protection of argon; adding the diethylene glycol solution containing stannic chloride and cobalt chloride into the above mixture solution while heating and stirring; reacting at 160 to 220 centigrade for 30 to 60 minutes; cooling to room temperature; adding ethanol; centrifuging to separate; and drying to obtain the final products. The method provided by the invention is simple, and the obtained composite material has a unique structure. The tin-cobalt alloy nanoparticles are uniformly adhered on the surface of the multi-walled carbon nanotubes, so that the composite material used as the negative electrode material of a lithium ion battery has lower reduction of irreversible capacity and higher cycle stability.

Description

technical field [0001] The invention belongs to the field of material science, and in particular relates to a preparation method of a composite material of multi-walled carbon nanotubes and tin-cobalt alloy nanoparticles. Background technique [0002] Metal tin material can form alloy Li with lithium 4.4 Sn has a very high lithium ion capacity, so metal tin alloys (such as tin-cobalt alloys) are considered as a potential lithium ion battery anode material to replace carbon materials with lower capacity. However, when metal tin bulk materials are used as lithium battery negative electrode materials, large volume expansion will occur during charging and discharging, resulting in the breakage of electrode materials and a rapid decline in battery cycle performance, which greatly limits the use of tin-based materials in lithium batteries. applications in ion batteries. Existing studies have shown that multi-walled carbon nanotubes have excellent electron transport properties, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/1393B82Y30/00B82Y40/00
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 杜宁翟传鑫杨德仁张辉
Owner ZHEJIANG UNIV
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